JPH0577922B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a steam temperature reduction device used for reducing the temperature of superheated steam.

Generally, steam is generated as relatively high-pressure steam in a steam generation source such as a boiler, and is used after being reduced in pressure at the inlet side of various steam-using equipment depending on the purpose of use of the steam-using equipment. Due to its nature, high-pressure steam becomes superheated steam when its pressure is reduced, making it difficult to adjust the amount of heat transferred in steam-using equipment and making uniform heat transfer impossible.

<Prior art> Generally, the temperature of superheated steam is reduced by this type of temperature reduction device by injecting cooling water into the flow of superheated steam and absorbing the thermal energy of the superheated steam by the latent heat of the cooling water. .

Therefore, conventionally, as shown in FIG. 2, a device has been used in which pressurized spray water is directly sprayed onto superheated steam from a spray nozzle 52 through a spray water pipe 50 to reduce the temperature to a predetermined temperature. This is done by arranging the spray nozzle 52 on the upstream side of the superheated steam passage 54 and providing a temperature detector 56 on the downstream side, so that the superheated steam reaches a predetermined temperature in response to the temperature detected by the temperature detector 56. to adjust the opening degree of the control valve 58. In other words, the deviation between the set value of the steam temperature and the detected temperature is calculated, the amount of spray from the spray nozzle 52 is determined by the PID controller so as to reduce this deviation to zero, and the control valve 58 is operated to adjust the steam temperature. It is something to control.

<Problems to be Solved by the Present Invention> The above-mentioned device includes a temperature detector that detects the reduced temperature of steam, a control valve that adjusts the opening degree according to the detected temperature, and the temperature sensor and the control valve. In addition, the temperature sensor had to be installed separately in the steam passage, and the control valve had to be installed in the spray water passage, respectively, resulting in increased equipment and construction costs. Additionally, there was the hassle of having to install piping for the spray water to the point of use.

In addition, the control became complicated, and determining the PID constant was difficult and required experience.

The technical problem of the present invention is to reduce the temperature of superheated steam with a simple device and without the need for complex controls.

<Means for Solving the Problems> The technical means of the present invention taken to solve the above-mentioned technical frame is that an impeller is arranged in a casing having an inlet and an outlet, and an end of a shaft supporting the impeller is provided. A resistor is attached to mechanically apply a load to the This resistor allows the magnitude of the mechanical load to be adjusted as desired.

<Operation> Superheated steam, which has a larger enthalpy than saturated steam even at the same pressure, is cooled to saturated steam by absorbing the excess heat relative to saturated steam as kinetic energy.

In other words, the superheated steam that flows in from the inlet of the casing converts part of its enthalpy into kinetic energy, which rotates the impeller and rotates the resistor that provides a mechanical load on the impeller shaft. I do the work. Therefore, by rotating the impeller, a part of the enthalpy of the superheated steam is absorbed and the temperature of the superheated steam is reduced to saturated steam.

<Example> An example showing a specific example of the above technical means will be described (see FIG. 1).

An impeller 8 is arranged within a casing 6 forming an inlet 2 and an outlet 4. Shaft 10 supporting the impeller
is passed through the center of the impeller 8, and its end is further passed through the back surface 6a of the casing 6. The case 14 is fixed to the back surface 6a of the casing 6 with the heat insulating material 12 interposed therebetween using bolts 16a and b.
At this time, an annular protrusion 18 provided at the center of the shaft 10 is sandwiched between thrust bearings 20 and 22 disposed between the back surface 6a and the case 14. Member number 24 is a sealing member, and 26 is a sleeve. The case 14 has a cylindrical shape, and a magnetic body 28 is attached to the end of the shaft 10 protruding from the bottom thereof with a nut 30.

A male thread is formed on the upper part of the case 14, and the female thread of the adjuster 32 is screwed to match the male thread. A magnetic body 34 is arranged at the bottom of the inner surface of the regulator 32 and attached with bolts 36a and b. The magnetic body 34 is placed so as to face the magnetic body 28, and the adjuster 3
The distance between the two magnetic bodies is changed by rotating the threaded portion between the magnetic body 2 and the case 14. That is, when the impeller 8 rotates, the smaller the distance between the two magnetic bodies, the greater the rotation resistance becomes, and the greater the distance, the smaller the resistance becomes.

The action is as follows. Superheated steam, which has a larger enthalpy than saturated steam, retains a part of its enthalpy as kinetic energy when flowing through the pipe, and the superheated steam that flows in from the inlet 2 of the casing 6 hits the impeller 8 and causes it to rotate. The impeller 8 includes a magnetic body 28 connected to the shaft 10,
Since it has a certain rotational resistance due to the superheated steam 34, it means that the superheated steam has done work on the impeller 8, and when it flows out from the outlet 4, it has lost part of its enthalpy and becomes saturated steam. That is, the excess heat of the superheated steam relative to the saturated steam is converted into kinetic energy and absorbed to reduce the temperature to the saturated steam temperature.

Then, the distance between the magnetic body 34 and the magnetic body 28 is adjusted by rotating the regulator 32 depending on the degree of superheating,
The rotational resistance of the impeller 8 can be changed, and as a result, the amount of work applied to the impeller can be changed. Moreover, once the adjustment is completed, the rotation speed of the impeller 8 increases or decreases depending on the flow rate of the passing superheated steam, and the amount of energy taken can be automatically controlled.

Although pressure loss of the steam may occur due to the resistance of the impeller 8, there is no need to worry because the excess heat of the superheated steam can compensate for the pressure drop.

<Specific effects> The present invention produces the following unique effects.

Conventionally, the temperature was reduced by absorbing thermal energy from superheated steam, which required spray water, and the control of the amount of water was complicated.
Since the present application absorbs kinetic energy, there is no need for spray water, and there is also no need for expensive pressure detectors, control valves, or connection lines that connect the two, making it possible to reduce the steam temperature at low cost with a simplified device. can.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a superheated steam temperature reduction device according to the present invention, and FIG. 2 is a conventional steam temperature reduction device. 2...Inlet, 4...Outlet, 6...Casing,
8... Impeller, 10... Shaft, 28, 34... Magnetic material.

Claims (1)

[Claims] 1. A superheated steam detemperature device characterized in that an impeller is disposed within a casing having an inlet and an outlet, and a resistor that mechanically applies a load is attached to the end of a shaft that supports the impeller.